linux-kernel - Re: [PATCH 01/27] block: bio: introduce 4 helpers for cleanup

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Date:	Tue, 5 Apr 2016 16:18:41 -0800
From:	Kent Overstreet <kent.overstreet@...il.com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Boaz Harrosh <boaz@...xistor.com>, Jan Kara <jack@...e.cz>,
	Keith Busch <keith.busch@...el.com>, Tejun Heo <tj@...nel.org>,
	Mike Snitzer <snitzer@...hat.com>
Subject: Re: [PATCH 01/27] block: bio: introduce 4 helpers for cleanup

On Tue, Apr 05, 2016 at 07:56:46PM +0800, Ming Lei wrote:
> Some drivers access bio->bi_vcnt and bio->bi_io_vec directly,
> firstly it isn't a good practice, secondly it may cause trouble
> for converting to multipage bvecs.

"not good practice" is OO bullshit snake oil without more justification. We
don't plaster accessors everywhere without an actual reason.

How would it cause trouble with multipage bvecs?